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<p>Lead-free dielectric ceramics are indispensable for modern pulse power systems due to their high energy density, environmental friendliness, and stable performance. Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub> (BNT)-based ceramics have garnered significant attention due to their high saturation polarization and high Curie temperature. However, the intrinsic long-range ferroelectric order of BNT leads to excessive remanent polarization (<i>P</i><sub>r</sub>), resulting in significant hysteresis loss and low conversion efficiency. This work designs and prepares (1-<i>x</i>)(0.68Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>–0.32SrTiO<sub>3</sub>)–<i>x</i>LaMg<sub>0.5</sub>Ti<sub>0.5</sub>O<sub>3</sub> (BNT-ST-LMT) ceramics using a multi-element solid solution strategy. The introduction of the LMT component disrupts the internal long-range ferroelectric order and enhances relaxor characteristics. An energy storage efficiency (<i>η</i>) of 87.1% is achieved, with a recoverable energy density (<i>W</i><sub>rec</sub>) of 2.67&#xa0;J/cm<sup>3</sup> under an electric field of 220&#xa0;kV/cm. The enhanced efficiency contributes to improved cyclic reliability and offers a viable route for optimizing BNT-based energy storage ceramics.</p>

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Achieving efficient energy storage in Bi0.5Na0.5TiO3-based ceramics via multicomponent doping

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Yuxi Hou,
  • Xinyue Li,
  • Haojie Wang,
  • Xujun Li,
  • Yongxing Wei,
  • Xin Zhao,
  • Yu Cong,
  • Shuitao Gu,
  • Zhonghua Dai

摘要

Lead-free dielectric ceramics are indispensable for modern pulse power systems due to their high energy density, environmental friendliness, and stable performance. Bi0.5Na0.5TiO3 (BNT)-based ceramics have garnered significant attention due to their high saturation polarization and high Curie temperature. However, the intrinsic long-range ferroelectric order of BNT leads to excessive remanent polarization (Pr), resulting in significant hysteresis loss and low conversion efficiency. This work designs and prepares (1-x)(0.68Bi0.5Na0.5TiO3–0.32SrTiO3)–xLaMg0.5Ti0.5O3 (BNT-ST-LMT) ceramics using a multi-element solid solution strategy. The introduction of the LMT component disrupts the internal long-range ferroelectric order and enhances relaxor characteristics. An energy storage efficiency (η) of 87.1% is achieved, with a recoverable energy density (Wrec) of 2.67 J/cm3 under an electric field of 220 kV/cm. The enhanced efficiency contributes to improved cyclic reliability and offers a viable route for optimizing BNT-based energy storage ceramics.